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—Do you know about the accident which happened in the center of the city?
—Yes. But it was some time           we realized the truth.

A.before B.when C.since D.until

A

解析试题分析:考查连词辨析。句意:——你知道发生在市中心的那起事故吗?——知道。但过了一段时间之后我才知道真相。答案选A。 句型:It was some time before……表示“过了一段时间之后才……”。
考点:考查连词辨析

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